采用电化学腐蚀试验与不同阴极极化电位下的慢应变速率拉伸试验,并结合XRD衍射图谱分析及SEM断口形貌观察,研究了阴极极化对峰时效(PA),双峰时效(DPA)以及回归冉时效(RRA) 7003铝合金在3.5％ NaCl溶液中应力腐蚀类型的影响.结果表明,在开路电位下7003铝合金的应力腐蚀主要由阳极溶解控制,应力腐蚀敏感性ISCC(PA)＞ISCC(DPA)＞ISCC(RRA).而外加阴极电位的情况下XRD衍射谱中出现AlH3衍射峰,断口形貌则表现出沿品及解理倾向,说明应力腐蚀转变为由氢脆控制,且氢脆敏感性(IHE)随着极化电位的负移而不断增加,其中3种时效状态的敏感性顺序为:IHE(PA)＞IHE(DPA)＞IHE(RRA).
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